<?php
include 'config/db.php';
?>

<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/5.3.1/css/bootstrap.min.css" rel="stylesheet">
    <title>课程评价</title>
</head>
<body>
    <nav class="navbar navbar-expand-sm navbar-light bg-light mb-4">
        <div class="container">
            <a href="#" class="navbar-brand">课程评价中心</a>
            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" 
            data-bs-target="#navbarNav" aria-controls="navbarNav" 
            aria-expanded="false" aria-label="切换导航">
            <span class="navbar-toggler-icon"></span>
            </button>
            <div class="collapse navbar-collapse" id="navbarNav">
                <ul class="navbar-nav ms-auto">
                    <li class="nav-item">
                        <a class="nav-link" href="/php-tutorial/course-review-app/index.php">首页</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="/php-tutorial/course-review-app/reviews.php">评价</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="/php-tutorial/course-review-app/about.php">关于</a>
                    </li>
                </ul>
            </div>
        </div>
    </nav>


    <main>
        <div class="container d-flex flex-column align-items-center">
           
